Nanomaterials for Polymer and Surfactant Flooding

Nanotechnology has emerged as a revolutionary approach in the oil and gas industry, particularly in enhanced oil recovery (EOR). This chapter explores the application of nanomaterials, specifically nanoparticles (NPs), with dimensions ranging from 1 to 100 nm, in various oilfield processes. The focus is on the preparation of nanofluids tailored for different reservoir conditions and their potential to improve rheological properties at real field conditions. The critical factor for successful nanofluid application in EOR is the rheological stability, which depends on the surface activity of the nanoparticles. This chapter presents experimental studies on nanofluid flow behavior through porous media, addressing factors such as nanoparticle size, stability, and their effects on oil recovery efficiency. SiO₂ nanoparticles are highlighted as particularly promising for EOR applications. The discussion extends to the challenges faced in nanofluid stability, emphasizing issues such as agglomeration over time and the impact of salinity on stability. Moreover, strategies were discussed to enhance stability, such as modifying surface properties, incorporating surfactants, and utilizing viscous base fluids. The stability of nanofluids is crucial for maintaining their effectiveness in EOR. This chapter delves into the promising combination of nanoparticles with polymers in polymer-nanoparticle (PN) flooding techniques. The chapter also identifies the main challenges associated with the use of nanomaterials (i.e., their stability) when used in combination with the other chemicals and explores the synergy between the binary and ternary combinations of nanomaterials, polymers and surfactants. The interactions between nanoparticles and polymers are studied for their impact on dispersion stability, wettability alteration, and interfacial tension reduction, all contributing to improved oil recovery efficiency. Despite the potential benefits of nanotechnology in EOR, challenges persist, including the lack of a comprehensive understanding of the oil displacement mechanism via nanoparticles. Finally, this chapter concludes by highlighting the ongoing research and the need for further exploration, offering insights into the prospects of nanofluids in advancing EOR methods. In summary, the chapter provides a comprehensive overview of the application of nanotechnology in EOR, addressing mechanisms, applications, and challenges. It serves as a valuable resource for researchers, engineers, and professionals in the petroleum industry seeking to harness the potential of nanomaterials for enhanced oil recovery.